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/* mga_drv.c -- Matrox g200/g400 driver -*- linux-c -*-

 * Created: Mon Dec 13 01:56:22 1999 by jhartmann@precisioninsight.com

 *

 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.

 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 *

 * Authors: Rickard E. (Rik) Faith <faith@valinux.com>

 *          Jeff Hartmann <jhartmann@valinux.com>

 *

 *

 */

#include <linux/config.h>

#include "drmP.h"

#include "mga_drv.h"

#define MGA_NAME         "mga"

#define MGA_DESC         "Matrox G200/G400"

#define MGA_DATE         "20000928"

#define MGA_MAJOR        2

#define MGA_MINOR        0

#define MGA_PATCHLEVEL   1

static drm_device_t           mga_device;

drm_ctx_t                     mga_res_ctx;

static struct file_operations mga_fops = {

#if LINUX_VERSION_CODE >= 0x020400

                                /* This started being used during 2.4.0-test */

        owner:   THIS_MODULE,

#endif

        open:    mga_open,

        flush:   drm_flush,

        release: mga_release,

        ioctl:   mga_ioctl,

        mmap:    drm_mmap,

        read:    drm_read,

        fasync:  drm_fasync,

        poll:    drm_poll,

};

static struct miscdevice      mga_misc = {

        minor: MISC_DYNAMIC_MINOR,

        name:  MGA_NAME,

        fops:  &mga_fops,

};

static drm_ioctl_desc_t       mga_ioctls[] = {

        [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]     = { mga_version,    0, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)]  = { drm_getunique,  0, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]   = { drm_getmagic,   0, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]   = { drm_irq_busid,  0, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)]  = { drm_setunique,  1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]       = { drm_block,      1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]     = { drm_unblock,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]     = { mga_control,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)]  = { drm_authmagic,  1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]     = { drm_addmap,     1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]    = { mga_addbufs,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]   = { mga_markbufs,   1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]   = { mga_infobufs,   1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]    = { mga_mapbufs,    1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]   = { mga_freebufs,   1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]     = { mga_addctx,     1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]      = { mga_rmctx,      1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]     = { mga_modctx,     1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]     = { mga_getctx,     1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)]  = { mga_switchctx,  1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]     = { mga_newctx,     1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]     = { mga_resctx,     1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]    = { drm_adddraw,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]     = { drm_rmdraw,     1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_DMA)]         = { mga_dma,        1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]        = { mga_lock,       1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]      = { mga_unlock,     1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]      = { drm_finish,     1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = { drm_agp_acquire, 1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = { drm_agp_release, 1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]  = { drm_agp_enable,  1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]    = { drm_agp_info,    1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]   = { drm_agp_alloc,   1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]    = { drm_agp_free,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]    = { drm_agp_bind,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]  = { drm_agp_unbind,  1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_INIT)]    = { mga_dma_init,    1, 1 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_SWAP)]    = { mga_swap_bufs,   1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_CLEAR)]   = { mga_clear_bufs,  1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_ILOAD)]   = { mga_iload,       1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_VERTEX)]  = { mga_vertex,      1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_FLUSH)]   = { mga_flush_ioctl, 1, 0 },

        [DRM_IOCTL_NR(DRM_IOCTL_MGA_INDICES)] = { mga_indices,     1, 0 },

};

#define MGA_IOCTL_COUNT DRM_ARRAY_SIZE(mga_ioctls)

#ifdef MODULE

static char                   *mga = NULL;

#endif

MODULE_AUTHOR("VA Linux Systems, Inc.");

MODULE_DESCRIPTION("Matrox G200/G400");

MODULE_LICENSE("GPL and additional rights");

MODULE_PARM(mga, "s");

#ifndef MODULE

/* mga_options is called by the kernel to parse command-line options passed

 * via the boot-loader (e.g., LILO).  It calls the insmod option routine,

 * drm_parse_drm.

 */

static int __init mga_options(char *str)

{

        drm_parse_options(str);

        return 1;

}

__setup("mga=", mga_options);

#endif

static int mga_setup(drm_device_t *dev)

{

        int i;

        atomic_set(&dev->ioctl_count, 0);

        atomic_set(&dev->vma_count, 0);

        dev->buf_use      = 0;

        atomic_set(&dev->buf_alloc, 0);

        drm_dma_setup(dev);

        atomic_set(&dev->total_open, 0);

        atomic_set(&dev->total_close, 0);

        atomic_set(&dev->total_ioctl, 0);

        atomic_set(&dev->total_irq, 0);

        atomic_set(&dev->total_ctx, 0);

        atomic_set(&dev->total_locks, 0);

        atomic_set(&dev->total_unlocks, 0);

        atomic_set(&dev->total_contends, 0);

        atomic_set(&dev->total_sleeps, 0);

        for (i = 0; i < DRM_HASH_SIZE; i++) {

                dev->magiclist[i].head = NULL;

                dev->magiclist[i].tail = NULL;

        }

        dev->maplist        = NULL;

        dev->map_count      = 0;

        dev->vmalist        = NULL;

        dev->lock.hw_lock   = NULL;

        init_waitqueue_head(&dev->lock.lock_queue);

        dev->queue_count    = 0;

        dev->queue_reserved = 0;

        dev->queue_slots    = 0;

        dev->queuelist      = NULL;

        dev->irq            = 0;

        dev->context_flag   = 0;

        dev->interrupt_flag = 0;

        dev->dma_flag       = 0;

        dev->last_context   = 0;

        dev->last_switch    = 0;

        dev->last_checked   = 0;

        init_timer(&dev->timer);

        init_waitqueue_head(&dev->context_wait);

        dev->ctx_start      = 0;

        dev->lck_start      = 0;

        dev->buf_rp       = dev->buf;

        dev->buf_wp       = dev->buf;

        dev->buf_end      = dev->buf + DRM_BSZ;

        dev->buf_async    = NULL;

        init_waitqueue_head(&dev->buf_readers);

        init_waitqueue_head(&dev->buf_writers);

        DRM_DEBUG("\n");

        /* The kernel's context could be created here, but is now created

           in drm_dma_enqueue.  This is more resource-efficient for

           hardware that does not do DMA, but may mean that

           drm_select_queue fails between the time the interrupt is

           initialized and the time the queues are initialized. */

        return 0;

}

static int mga_takedown(drm_device_t *dev)

{

        int               i;

        drm_magic_entry_t *pt, *next;

        drm_map_t         *map;

        drm_vma_entry_t   *vma, *vma_next;

        DRM_DEBUG("\n");

        if (dev->dev_private) mga_dma_cleanup(dev);

        if (dev->irq) mga_irq_uninstall(dev);

        down(&dev->struct_sem);

        del_timer(&dev->timer);

        if (dev->devname) {

                drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);

                dev->devname = NULL;

        }

        if (dev->unique) {

                drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);

                dev->unique = NULL;

                dev->unique_len = 0;

        }

                                /* Clear pid list */

        for (i = 0; i < DRM_HASH_SIZE; i++) {

                for (pt = dev->magiclist[i].head; pt; pt = next) {

                        next = pt->next;

                        drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);

                }

                dev->magiclist[i].head = dev->magiclist[i].tail = NULL;

        }

                                /* Clear AGP information */

        if (dev->agp) {

                drm_agp_mem_t *entry;

                drm_agp_mem_t *nexte;

                                /* Remove AGP resources, but leave dev->agp

                                   intact until cleanup is called. */

                for (entry = dev->agp->memory; entry; entry = nexte) {

                        nexte = entry->next;

                        if (entry->bound) drm_unbind_agp(entry->memory);

                        drm_free_agp(entry->memory, entry->pages);

                        drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);

                }

                dev->agp->memory = NULL;

                if (dev->agp->acquired) _drm_agp_release();

                dev->agp->acquired = 0;

                dev->agp->enabled  = 0;

        }

                                /* Clear vma list (only built for debugging) */

        if (dev->vmalist) {

                for (vma = dev->vmalist; vma; vma = vma_next) {

                        vma_next = vma->next;

                        drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);

                }

                dev->vmalist = NULL;

        }

                                /* Clear map area and mtrr information */

        if (dev->maplist) {

                for (i = 0; i < dev->map_count; i++) {

                        map = dev->maplist[i];

                        switch (map->type) {

                        case _DRM_REGISTERS:

                        case _DRM_FRAME_BUFFER:

#ifdef CONFIG_MTRR

                                if (map->mtrr >= 0) {

                                        int retcode;

                                        retcode = mtrr_del(map->mtrr,

                                                           map->offset,

                                                           map->size);

                                        DRM_DEBUG("mtrr_del = %d\n", retcode);

                                }

#endif

                                drm_ioremapfree(map->handle, map->size, dev);

                                break;

                        case _DRM_SHM:

                                drm_free_pages((unsigned long)map->handle,

                                               drm_order(map->size)

                                               - PAGE_SHIFT,

                                               DRM_MEM_SAREA);

                                break;

                        case _DRM_AGP:

                                break;

                        }

                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);

                }

                drm_free(dev->maplist,

                         dev->map_count * sizeof(*dev->maplist),

                         DRM_MEM_MAPS);

                dev->maplist   = NULL;

                dev->map_count = 0;

        }

        if (dev->queuelist) {

                for (i = 0; i < dev->queue_count; i++) {

                        drm_waitlist_destroy(&dev->queuelist[i]->waitlist);

                        if (dev->queuelist[i]) {

                                drm_free(dev->queuelist[i],

                                         sizeof(*dev->queuelist[0]),

                                         DRM_MEM_QUEUES);

                                dev->queuelist[i] = NULL;

                        }

                }

                drm_free(dev->queuelist,

                         dev->queue_slots * sizeof(*dev->queuelist),

                         DRM_MEM_QUEUES);

                dev->queuelist   = NULL;

        }

        drm_dma_takedown(dev);

        dev->queue_count     = 0;

        if (dev->lock.hw_lock) {

                dev->lock.hw_lock    = NULL; /* SHM removed */

                dev->lock.pid        = 0;

                wake_up_interruptible(&dev->lock.lock_queue);

        }

        up(&dev->struct_sem);

        return 0;

}

/* mga_init is called via init_module at module load time, or via

 * linux/init/main.c (this is not currently supported). */

static int __init mga_init(void)

{

        int                   retcode;

        drm_device_t          *dev = &mga_device;

        DRM_DEBUG("\n");

        memset((void *)dev, 0, sizeof(*dev));

        dev->count_lock   = SPIN_LOCK_UNLOCKED;

        sema_init(&dev->struct_sem, 1);

#ifdef MODULE

        drm_parse_options(mga);

#endif

        if ((retcode = misc_register(&mga_misc))) {

                DRM_ERROR("Cannot register \"%s\"\n", MGA_NAME);

                return retcode;

        }

        dev->device = MKDEV(MISC_MAJOR, mga_misc.minor);

        dev->name   = MGA_NAME;

        drm_mem_init();

        drm_proc_init(dev);

        dev->agp    = drm_agp_init();

        if(dev->agp == NULL) {

                DRM_INFO("The mga drm module requires the agpgart module"

                         " to function correctly\nPlease load the agpgart"

                         " module before you load the mga module\n");

                drm_proc_cleanup();

                misc_deregister(&mga_misc);

                mga_takedown(dev);

                return -ENOMEM;

        }

#ifdef CONFIG_MTRR

        dev->agp->agp_mtrr = mtrr_add(dev->agp->agp_info.aper_base,

                                      dev->agp->agp_info.aper_size * 1024 * 1024,

                                      MTRR_TYPE_WRCOMB,

                                      1);

#endif

        if((retcode = drm_ctxbitmap_init(dev))) {

                DRM_ERROR("Cannot allocate memory for context bitmap.\n");

                drm_proc_cleanup();

                misc_deregister(&mga_misc);

                mga_takedown(dev);

                return retcode;

        }

        DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",

                 MGA_NAME,

                 MGA_MAJOR,

                 MGA_MINOR,

                 MGA_PATCHLEVEL,

                 MGA_DATE,

                 mga_misc.minor);

        return 0;

}

/* mga_cleanup is called via cleanup_module at module unload time. */

static void __exit mga_cleanup(void)

{

        drm_device_t          *dev = &mga_device;

        DRM_DEBUG("\n");

        drm_proc_cleanup();

        if (misc_deregister(&mga_misc)) {

                DRM_ERROR("Cannot unload module\n");

        } else {

                DRM_INFO("Module unloaded\n");

        }

        drm_ctxbitmap_cleanup(dev);

#ifdef CONFIG_MTRR

        if(dev->agp && dev->agp->agp_mtrr) {

                int retval;

                retval = mtrr_del(dev->agp->agp_mtrr,

                                  dev->agp->agp_info.aper_base,

                                  dev->agp->agp_info.aper_size * 1024*1024);

                DRM_DEBUG("mtrr_del = %d\n", retval);

        }

#endif

        mga_takedown(dev);

        if (dev->agp) {

                drm_agp_uninit();

                drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);

                dev->agp = NULL;

        }

}

module_init(mga_init);

module_exit(mga_cleanup);

int mga_version(struct inode *inode, struct file *filp, unsigned int cmd,

                  unsigned long arg)

{

        drm_version_t version;

        int           len;

        if (copy_from_user(&version,

                           (drm_version_t *)arg,

                           sizeof(version)))

                return -EFAULT;

#define DRM_COPY(name,value)                                 \

        len = strlen(value);                                 \

        if (len > name##_len) len = name##_len;              \

        name##_len = strlen(value);                          \

        if (len && name) {                                   \

                if (copy_to_user(name, value, len))          \

                        return -EFAULT;                      \

        }

        version.version_major      = MGA_MAJOR;

        version.version_minor      = MGA_MINOR;

        version.version_patchlevel = MGA_PATCHLEVEL;

        DRM_COPY(version.name, MGA_NAME);

        DRM_COPY(version.date, MGA_DATE);

        DRM_COPY(version.desc, MGA_DESC);

        if (copy_to_user((drm_version_t *)arg,

                         &version,

                         sizeof(version)))

                return -EFAULT;

        return 0;

}

int mga_open(struct inode *inode, struct file *filp)

{

        drm_device_t  *dev    = &mga_device;

        int           retcode = 0;

        DRM_DEBUG("open_count = %d\n", dev->open_count);

        if (!(retcode = drm_open_helper(inode, filp, dev))) {

#if LINUX_VERSION_CODE < 0x020333

                MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */

#endif

                atomic_inc(&dev->total_open);

                spin_lock(&dev->count_lock);

                if (!dev->open_count++) {

                        spin_unlock(&dev->count_lock);

                        return mga_setup(dev);

                }

                spin_unlock(&dev->count_lock);

        }

        return retcode;

}

int mga_release(struct inode *inode, struct file *filp)

{

        drm_file_t    *priv   = filp->private_data;

        drm_device_t  *dev;

        int           retcode = 0;

        lock_kernel();

        dev    = priv->dev;

        DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",

                  current->pid, dev->device, dev->open_count);

        if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)

            && dev->lock.pid == current->pid) {

                mga_reclaim_buffers(dev, priv->pid);

                DRM_INFO("Process %d dead (ctx %d, d_s = 0x%02lx)\n",

                         current->pid,

                         _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock),

                         dev->dev_private ?

                         ((drm_mga_private_t *)dev->dev_private)

                         ->dispatch_status

                         : 0);

                if (dev->dev_private)

                        ((drm_mga_private_t *)dev->dev_private)

                                ->dispatch_status &= MGA_IN_DISPATCH;

                drm_lock_free(dev,

                              &dev->lock.hw_lock->lock,

                              _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

        } else if (dev->lock.hw_lock) {

                /* The lock is required to reclaim buffers */

                DECLARE_WAITQUEUE(entry, current);

                add_wait_queue(&dev->lock.lock_queue, &entry);

                for (;;) {

                        current->state = TASK_INTERRUPTIBLE;

                        if (!dev->lock.hw_lock) {

                                /* Device has been unregistered */

                                retcode = -EINTR;

                                break;

                        }

                        if (drm_lock_take(&dev->lock.hw_lock->lock,

                                          DRM_KERNEL_CONTEXT)) {

                                dev->lock.pid       = priv->pid;

                                dev->lock.lock_time = jiffies;

                                atomic_inc(&dev->total_locks);

                                break;  /* Got lock */

                        }

                                /* Contention */

                        atomic_inc(&dev->total_sleeps);

                        schedule();

                        if (signal_pending(current)) {

                                retcode = -ERESTARTSYS;

                                break;

                        }

                }

                current->state = TASK_RUNNING;

                remove_wait_queue(&dev->lock.lock_queue, &entry);

                if(!retcode) {

                        mga_reclaim_buffers(dev, priv->pid);

                        if (dev->dev_private)

                                ((drm_mga_private_t *)dev->dev_private)

                                        ->dispatch_status &= MGA_IN_DISPATCH;

                        drm_lock_free(dev, &dev->lock.hw_lock->lock,

                                      DRM_KERNEL_CONTEXT);

                }

        }

        drm_fasync(-1, filp, 0);

        down(&dev->struct_sem);

        if (priv->remove_auth_on_close == 1) {

                drm_file_t *temp = dev->file_first;

                while(temp) {

                        temp->authenticated = 0;

                        temp = temp->next;

                }

        }

        if (priv->prev) priv->prev->next = priv->next;

        else            dev->file_first  = priv->next;

        if (priv->next) priv->next->prev = priv->prev;

        else            dev->file_last   = priv->prev;

        up(&dev->struct_sem);

        drm_free(priv, sizeof(*priv), DRM_MEM_FILES);

#if LINUX_VERSION_CODE < 0x020333

        MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */

#endif

        atomic_inc(&dev->total_close);

        spin_lock(&dev->count_lock);

        if (!--dev->open_count) {

                if (atomic_read(&dev->ioctl_count) || dev->blocked) {

                        DRM_ERROR("Device busy: %d %d\n",

                                  atomic_read(&dev->ioctl_count),

                                  dev->blocked);

                        spin_unlock(&dev->count_lock);

                        unlock_kernel();

                        return -EBUSY;

                }

                spin_unlock(&dev->count_lock);

                unlock_kernel();

                return mga_takedown(dev);

        }

        spin_unlock(&dev->count_lock);

        unlock_kernel();

        return retcode;

}

/* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */

int mga_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,

                unsigned long arg)

{

        int              nr      = DRM_IOCTL_NR(cmd);

        drm_file_t       *priv   = filp->private_data;

        drm_device_t     *dev    = priv->dev;

        int              retcode = 0;

        drm_ioctl_desc_t *ioctl;

        drm_ioctl_t      *func;

        atomic_inc(&dev->ioctl_count);

        atomic_inc(&dev->total_ioctl);